Joint.



CHARLES PARBY VAUCLAIN, OF ROSEMONT, PENNSYLVANEA., ASSIGNOB. fi'O THE PORATION OF PENNSYLVANA.

ALDWIN LOGOMOTIVE WORKS, 0F PHILADELPHIA, PENNSYLVANIA, A COLE- Specification of Letters Patenti Patented Feb. 2,

Application filed February 11, 1913. Serial '1%. 747,6119.

To all whom it may concern .Be it known that I, CHARLES l?. VancniIN, a citizen oi the United States, residing in Rosemont, countj7 of Rosemont, State of Pennsylvania, have invented certain Improvements in Joints, of which the following is a specification.

The ob'ect of my invention is to make a steam tight joint between a stay bolt socket and its cap. This object I attain by forming n rib on the socket and breaking down and compressing the material of the rib by screwing the cap onto the socket, thus making a steam tight joint.

In the accompanying drawings z-Fignre l is a sectional view showing the stay bolt socket and the cap detached therefrom and illustrating my invention; Fig. 2 is an end View of the socket; Fig. 3 is a sectional View. similar to Fig. l, with-the cap attached and the edge of the socket compressed to form a steam tight joint; Fig. fl is an enlarged vien7 of a portion oi' the socket section, showing the tapered end prior to being compressed by the ca and Fig. 5 is a view, similar to Fig. 4, s owing the' end afterbeing compressed by the cap to form the joint.

Referring to the drawings, 1 is the casing of a boiler. 2 is the threaded socket screwed into an opening in the boiler casing and having a seat- 3 for the rounded head of the stay bolt 5, which connects one wall of the sheet of the boiler to another. While the stay bolt is always under tension, the joint between the head 4 of the stay bolt and the seat is not steam tight, consequently, a cap has to be used which has an internal screw thread 7 adapted tothe thread on the pe -riphery of the socket member 2. This cap has a flat surface 8 which, when the socket member is made in the ordinary manner, rests against the iat end of the socket member and in order to make a tight joint be -tween the two parts, the surfaces have to be accurately finished or a gasket of copper, or other metal, is located between the two parts. This construction is'not always satisfactory.

l have found by materially reducing the area of the end of the socket erably by lieveling one or 1both. faces to forro an annular rib 9, :s indicated in the drawing, and arranging the surface 8 of the cap so that it Will Contact 1vit-h the narrow edge of the rib that when the cap is screwed tightly onto the socket member, as ill-nstrated in 3, it will compress the metal of this rib, forming its own seat, which 'will he steam tight in every instance, and making 1t possible to dispense with gaskets or other packing and also dispensing with the grindM ing of the parte.

l may not carry the con'ipression to th crushing point or past the elastic limit the material which will make a good j as illustrated in. Fig. 3. l may, hn carry the compression past the limit in some instances, forming a joint illustrated in F ig. 3, and the end of the rih will be compressed, as illustrated in Fig. 5, which will also make a good joint. In this particu lar instance a seat is formed by compressing the metal of the rib.

I claim :A

The combination ot threaded socket member, prei- In testimony whereof. l have signed my name to this specification, in the presence of two subscribing witnesses.

CHARLES PARRY VAUClJAIN.

Witnesses WM. E. Sr-iUPF., WM. A. BARR. 

